create API server

backend/index.js

@@ -0,0 +1,15 @@
+const express = require('express');
+const app = express();
+
+// "/"
+const indexRoute = require('./routes/index');
+app.use('/', indexRoute);
+
+// "/projects"
+const projectsRoute = require('./routes/projects');
+app.use('/projects', projectsRoute);
+
+const PORT = process.env.PORT || 3001;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});